Process of dyeing



Patented May 6, 1930 UNITED STATES PATENT; OFFICE JAMES BADDILEY, OF BLACKLEY, MANCHESTER, ENGLAND, ASSIGNOR TO BRITISH DYESTUFFS CORPORATION LIMITED, 01? MANCHESTER, ENGLAND PROCESS OF DYEING No Drawing. Application filed Kay 26, 1927, Serial No. 194,542, and in Great Britain September 7, 19%. Divided and this application filed December 11, 1928. Serial No. 325,397. Renewed September 24, 1988.

In my co-pending application Serial No. 194,542, I have described the dyeing of regenerated cellulose silk,such as viscose silk,

in level shades,with the monoazo dyestuffs obtained on coupling diazotized aromatic amines, their homologues, derivatives, and

the sulphonic acids and earboxylic acidsthereof with a 2-amino-5-naphthol-7-sulphonic acid, including in this expression its N -substituted derivatives. Some of the dyestuffs of this class are already known but they have never been used commercially, probably because they possess too small an affinity for cotton.

It is stated in the above mentioned application that I have made the entirely unexvalue to those engaged in the process of dyeing regenerated cellulose silks.

Among the dyes included in the above, I have found that the monoazo dyestuii obtained by coupling diazotized aniline with a benzoylated 2 amino 5 naphthol 7 sulphonic acid gives particularly very even dyeings on regenerated cellulose silk; In the above example in place of aniline, there may be substituted beta-naphthylamine, paranitroaniline, meta-aminobenzonic acid, 2 naphthylamine-6:8-disulphonic acid and ara-chloroaniline, the dyestuffs obtained bemg especially valuable in producing level shades in dyeings on regenerated cellulose silk. These aryl amines have'the general formula H Nl t wherein R represents a phenyl or naphthyl residue or the nitro, chloro, sulphonic or carboxylie derivatives of such residue.

The regenerated cellulose silk materials are dyed in the usual Way. The following description is typical of the manner in which the dyeing may be carried out, but it must be understood that these conditions may 1 varied. considerably and that I do not mit myself to the conditions given in the exstuff produced by combining the diazo com-- pound of aniline with benzoyl-2-amino-5 nahpthol-7-sulphonic acid. 100 parts of the regenerated cellulose silk material are entered into the dyebath, which is then brought to the boil. About 10 parts of Glaubers salt or common salt are then added and dyeing allowed to proceed at or near the boil for hour. If desired soap may be added to the dyebath. The fabric is dyed a bright red shade, the dyeing being particularly level.

What I claim and desire to secure by Letters Patent is 1. A process of dyeing regenerated cellulose material in level shades, characterized by the application to the material of a monoazo dyestufi .obtained by coupling a benzoylated 2-amino-5-naphthol-7-sulphonic acid with diazotized aniline.

2. The process of dyeing regenerated cellulose material in level shades characterized by the application to the material of monoazo dyestuifs obtained in coupling benzoylated 2-amino-5-naphthol-7-sulphonic acid with a diazo compound.

3. The process of dyeing regenerated cellulose material in level shades characterized by the application to the material of a monoazo dyestufi obtained b coupling benzoylated 2-amino-5-naphthol- -sulphonic acid with a diazotized aryl amine having the general formula I-LN R wherein R represents a phenyl or naphthyl residue or the nitro, chloro, sulphonic or carboxylic derivatives of such residue.

In witness whereof I affix my signature.

JAMES BADDILEY. 

